GENERAL DESCRIPTION
The AD74001 is a second-order, sigma-delta (Σ-Δ) modulator
that converts an analog input signal to a high speed, 1-bit data
stream with on-chip digital isolation based on Analog Devices, Inc. iCoupler® technology. The AD7400 operates from a 5 V
power supply and accepts a differential input signal of ±200 mV
(±320 mV full scale). The analog input is continuously sampled
by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained
in the output stream as a density of ones with a data rate of 10 MHz. The original information can be reconstructed with an
appropriate digital filter. The serial I/O can use a 5 V or a 3 V
supply (VDD2).
The serial interface is digitally isolated. High speed CMOS,
combined with monolithic air core transformer technology, means the on-chip isolation provides outstanding performance
characteristics superior to alternatives such as optocoupler devices. The part contains an on-chip reference. The AD7400 is
offered in a 16-lead SOIC and has an operating temperature
range of −40°C to +105°C. An external clock version, AD7401, is also available.

FEATURES
10 MHz clock rate Second-order modulator
16 bits no missing codes
±2 LSB INL typical at 16 bits 3.5 μV/°C maximum offset drift
On-board digital isolator On-board reference Low power operation: 18 mA maximum at 5.25 V
−40°C to +105°C operating range
16-lead SOIC package
Safety and regulatory approvals UL recognition 5000 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice #5A VDE Certificate of Conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 VIORM = 891 V peak

APPLICATIONS
AC motor controls
Data acquisition systems
A/D + opto-isolator replacements